Abstract
The article presents the results of isotope-chemical research of the Tavatum thermal water deposit (coast of the Sea of Okhotsk, Magadanskaya Oblast), as well as surrounding underground and surface waters. For the first time, data on the content of isotopes of oxygen and hydrogen in the underground and surface waters were obtained, and the analysis of trace elements was performed. The results show that the chloride sodium-calcium mesohalinous thermal waters of the Tavatum deposit are atmogenic; two processes can be considered as the main processes of the chemical composition formation: 1) involvement of deep brines (including cryopeg waters) and 2) cationic exchange in the interaction of sea waters (buried during marine transgressions in the Holocene) with rocks. In the chemical composition of thermal waters, there are indicator chemical elements reflecting the impact of deep high-temperature processes. The temperature of the deep fluid estimated by different geothermometers is 117 to 128°C, and the depth of formation is at least three kilometers.
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